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Carbon		0.33 - 0.43
Chromium		4.75 - 5.5
Iron		Balance
Manganese		0.2 - 0.5
Molybdenum		1.1 - 1.6
Phosphorus		0.03 max
Silicon		0.8 - 1.2
Sulphur		0.03 max
Vanadium		0.3 - 0.6

Principal Design Features		This alloy is one of the Hot Work, Chromium type tool steels. It is relatively low in carbon content and has good toughness and deep hardens by air quench from heat treatment.

Applications		H11 is often used for highly stressed structural parts such as aircraft landing gear. It resists softening at temperatures up to 1000 F while retaining good ductility and toughness even at strength levels on the order of 275 ksi.

Machinability		Machinability is reasonably good, approximately 75% that of the W group water hardening low alloy tool steels.

Forming		Forming characteristics of H11 are good by conventional methods. It also may be formed by forging and machining.

Welding		H11 is a readily weldable alloy by conventional methods.

Heat Treatment		Preheat to 1500 F and then heat to 1850 F and hold for 15 to 40 minutes. Air cool (air quench).

Forging		Forge at 2050 F down to 1700 F. Do not forge below 1650 F.

Hot Working		No data given. The alloy may be hot worked by "Forging".

Cold Working		Cold working may readily be accomplished on H11 by conventional methods.

Annealing		Anneal at 1600 F and slow cool at 40 F per hour or less in the furnace.

Aging		Not applicable to this alloy.

Tempering		Temper at 1000 F to 1200 F for Rockwell C hardness of 54 to 38. Double tempering for one hour each time at the selected tempering temperature is recommended.

Hardening		See "Heat Treatment" and "Tempering".

Other Comments		H11 provides good toughness with high strength even at elevated temperature.

Physical Data : [top]

Density (lb / cu. in.)	0.281
Specific Gravity	7.8
Melting Point (Deg F)	2600
Modulus of Elasticity Tension	29

MSO currently has no data available for this grade.